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Don't consider defending queen as check blocker (#1328)

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STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 22636 W: 4212 L: 3990 D: 14434
http://tests.stockfishchess.org/tests/view/5a2506140ebc590ccbb8b75a

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 63448 W: 8287 L: 7965 D: 47196
http://tests.stockfishchess.org/tests/view/5a253a610ebc590ccbb8b776

bench: 5767699
This commit is contained in:
Günther Demetz 2017-12-06 14:23:41 +01:00 • committed by Marco Costalba
parent be382bb0cf
commit 196ae7c38b
1 changed files with 2 additions and 2 deletions
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4
src/evaluate.cpp
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@ -459,8 +459,8 @@ namespace {
safe = ~pos.pieces(Them);
safe &= ~attackedBy[Us][ALL_PIECES] | (weak & attackedBy2[Them]);
b1 = pos.attacks_from< ROOK>(ksq);
b2 = pos.attacks_from<BISHOP>(ksq);
b1 = attacks_bb<ROOK >(ksq, pos.pieces() ^ pos.pieces(Us, QUEEN));
b2 = attacks_bb<BISHOP>(ksq, pos.pieces() ^ pos.pieces(Us, QUEEN));
// Enemy queen safe checks
if ((b1 | b2) & attackedBy[Them][QUEEN] & safe & ~attackedBy[Us][QUEEN])